Do you know where you lost it?
Must be using Windows. Linux for the win.
Lost your email? Your email is being saved on the server of the email provider and not on your local hard disk. You should be able to login to the email via your webbrowser.
What do you mean with you have lost your drive? Does your OS doesn't start up? Do you get a blue screen with some error codes? Does it spin? if you get an error please tell me.
Maybe you can do a system recovery.
If it does spin and you get some error code you still can use HiRen boot CD to get your documents. If you have an another computer you can put the harddisk as a second harddisk in the other computer. You should be able to see all your files.
If the drive spins you can fix this easily, if it doesn't spin that the harddisk is toasted. I have fixed these kind of problems many times.
Please let me know.